Part I. General background. Some basics of class-set theory. The natural number. Superinduction, well ordering and choice. Ordinal numbers. Order isomorphism and transfinite recursion. Rank. Foundation, e-induction, and rank. Cardinals. Part II. Mostowski-Shepherdson Mappings. Reflection principles. Constructible sets. L is well founded first-order universe. Constructability is absolute over L. Constructability and the continuum hypothesis. Part III. Forcing, the very idea. The construction of S4 models and ZF. The axion of constructability is independent. Independence of the continuum hypothesis. Independence of the axiom of choice. Constructing classical models. Forcing background. References. Subject Index. Notation Index
